#include<stdio.h>
#include<malloc.h>
#define MaxSize 100
typedef char ElemType;
typedef struct
{
	ElemType data[MaxSize];
	int top;
 } SqStack;
void InitStack(SqStack *&s)
{
	s=(SqStack*)malloc(sizeof(SqStack));
	s->top=-1;
 } 
void DestroyStack(SqStack*&s) 
{
	free(s);
}
bool StackEmpty(SqStack*s)
{
	return(s->top==-1);
}
bool push(SqStack*&s,ElemType e)
{
	if(s->top==MaxSize -1)
	{
		return false;
    }
    s->top++;
    s->data[s->top]=e;
    return true;  
}
bool push(SqStack*&s,ElemType &e)
{
	if(s->top== -1)
	{
		return false;
	}
	e=s->data[s->top];
	s->top--;
	return true;
}
bool GetTop(SqStack*&s,ElemType &e)
{
	if(s->top==-1)
	{
		return false;
	}
	e=s->data[s->top];
	return true;
}